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Junior Subordinated Debentures Issued to Capital Trusts (Details) - USD ($) | 1 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Dec. 31, 2006 | Oct. 31, 2004 | Jun. 30, 2004 | Mar. 30, 2004 | Oct. 31, 2003 | Jun. 30, 2003 | Dec. 31, 2020 | Jun. 24, 2020
Subordinate Debenture [Line Items] |  |  |  |  |  |  |  |
Junior subordinated debentures and the securities variable rate |  |  |  |  |  |  | 5.49% |
Interest rate on junior subordinated debentures and securities |  |  |  |  |  |  |  | 5.625%
Salin |  |  |  |  |  |  |  |
Subordinate Debenture [Line Items] |  |  |  |  |  |  |  |
Trust Preferred Capital Securities Sold |  |  |  |  | $ 20,000,000.0 |  |  |
Junior subordinated debentures and the securities variable rate |  |  |  |  | 2.95% |  |  |
Interest rate on junior subordinated debentures and securities |  |  |  |  |  |  | 3.19% |
Subordinated notes |  |  |  |  |  |  | $ 17,800,000 |
Horizon Statutory Trust II |  |  |  |  |  |  |  |
Subordinate Debenture [Line Items] |  |  |  |  |  |  |  |
Trust Preferred Capital Securities Sold |  | $ 10,300,000 |  |  |  |  |  |
Junior subordinated debentures and the securities variable rate |  | 1.95% |  |  |  |  |  |
Interest rate on junior subordinated debentures and securities |  |  |  |  |  |  | 2.19% |
Cost of issuance of the securities |  |  |  |  |  |  | $ 17,500 |
Horizon Bancorp Capital Trust III |  |  |  |  |  |  |  |
Subordinate Debenture [Line Items] |  |  |  |  |  |  |  |
Trust Preferred Capital Securities Sold | $ 12,400,000 |  |  |  |  |  |  |
Junior subordinated debentures and the securities variable rate | 1.65% |  |  |  |  |  |  |
Interest rate on junior subordinated debentures and securities |  |  |  |  |  |  | 1.89% |
Cost of issuance of the securities |  |  |  |  |  |  | $ 12,647 |
Alliance Financial Statutory Trust I |  |  |  |  |  |  |  |
Subordinate Debenture [Line Items] |  |  |  |  |  |  |  |
Trust Preferred Capital Securities Sold |  |  | $ 5,200,000 |  |  |  |  |
Junior subordinated debentures and the securities variable rate |  |  | 2.65% |  |  |  |  |
Interest rate on junior subordinated debentures and securities |  |  |  |  |  |  | 2.89% |
Am Tru Statutory Trust I |  |  |  |  |  |  |  |
Subordinate Debenture [Line Items] |  |  |  |  |  |  |  |
Trust Preferred Capital Securities Sold |  |  |  | $ 3,500,000 |  |  |  |
Junior subordinated debentures and the securities variable rate |  |  |  | 2.85% |  |  |  |
Interest rate on junior subordinated debentures and securities |  |  |  |  |  |  | 3.09% |
Subordinated notes |  |  |  |  |  |  | $ 3,500,000 |
Heartland Trust |  |  |  |  |  |  |  |
Subordinate Debenture [Line Items] |  |  |  |  |  |  |  |
Trust Preferred Capital Securities Sold | $ 3,000,000.0 |  |  |  |  |  |  |
Junior subordinated debentures and the securities variable rate | 1.67% |  |  |  |  |  |  |
Interest rate on junior subordinated debentures and securities |  |  |  |  |  |  | 1.91% |
Subordinated notes |  |  |  |  |  |  | $ 2,000,000.0 |
City Savings Trust |  |  |  |  |  |  |  |
Subordinate Debenture [Line Items] |  |  |  |  |  |  |  |
Trust Preferred Capital Securities Sold |  |  |  |  |  | $ 5,000,000.0 |  |
Junior subordinated debentures and the securities variable rate |  |  |  |  |  | 3.10% |  |
Interest rate on junior subordinated debentures and securities |  |  |  |  |  |  | 3.34% |
Subordinated notes |  |  |  |  |  |  | $ 4,500,000 |

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